John mitchell



(No Model.)

J. MITCHELL. CORRUGATED STRUCTURE.

No. 429,937. Patented June 10, 1890.

W/T/VESSES: m mvrom ww/w ATTbP/VEYS.

- ticularly the objects of UNITED. Sr-ATEsfPy-rnitr Or'rrcE.

JOHN MITCHELL, oF AUoKLAND, E ZEALAND.

COR UGATED s'rnucrue.

srncrrrcnrron forming part of Letters Patent No. 429,937, dated runs 10, 1890.

I Application filed Hay-28, 1889- Serial 110.312,!586. (No model.)

Patented in New z'entna May 22, 1888, No. 3,000, in Victoria September 27, 1888,1lo. 6,217, and in l lew South Wales October 1, 1888, No. 972.

To all whom it may concern:

Be it. known that I, JOHN MITCHELL, of

Auckland, New Zealand, have invented a new and usefullmprovementin Corrugated Structures, (for which I have obtained Letters Patent in New Zealand, dated May 22, 1888, No. 3,000; in New South Wales, dated October 1, 1888, N o. 972, Book 2, and in Victoria, dated September 27, 1888, No.6,217,) of which the {ollowing is a full, clear, and exact descripion. I

This invention,while more particularly designed to be applied to corrugated metal roofing, and it will herebe described more'especially with reference to such use, is suitable for any structure or portion of structure in which corrugated sheets of iron, brass, steel, paper, or othermaterial is requiredto be fixed or supported in place by under or backing strips, on or against which said corrugated sheets rest, and to which they may be secured by any suitable means. Thus the invention may not only be applied tothe roofs of buildmgs, but also to car-roofs, ceilings, walls, fences, and other structures, regardless of their shape, which and the corrugated sheets used in the structure may either be of a plenum-curved, or spherical form.

The object of the invention-as, for instance, applied to iron roofing for buildings is to provide a solid support for the corrugated sheets composing such roofing, in order to give them firmness and strength and to lessen the liability of their spreading, being depressed, dinted, or shaking with the wind, or of being bruised, either when punching holes in the sheets for the introduction of retaining screws or nails or by treading on them, erecting a superstructure on them, or by subjecting them to pressure of diiferent kinds from any cause. These are more parthe invention; but there are others or further special advan-" tages, as hereinafter referred to, which are also obtained.

The invention consists in struction and arrangement of the corrugated sheets upon the corrugated battens, which will hereinafter be fully described in the an: nexed specification and particularly pointed out in the claim.

the peculiar con- Reference is to be had to the accompanying drawing, which represents a view in perspective of a corrugated-metal root in part with my invention applied.

A A indicate certain of the corrugatedmetal sheets used in the construction of the roof, and B B the corrugated battens, upon which said sheets at their under or rear sides are seen red and supported, said battens being 6c arranged to cross the corrugations in the sheets and being themselves corrugated transversely of their length. The corrugations in sheets A are of a less depth than the corrugations in the battens, whereby an open space,

as c, is formed at the base of the corrugations .for a purpose hereinafter explained.

O O are purlins carrying the battens; or they may be supported by boards D, (shown by dotted lines,) or be otherwise carried and secured in place.

The battens B, having a corrugated surface, as described, may be made of wood or any other suitable material, and the corrugations be formed in them by any suitable means or in any desired manner. Nails 1), screws, or other fastenings may be used to hold the corrugated sheets to their places upon the corrugated battens. The corrugated she'ets being thus solidly supported upon and secured to the corrugated battens, they will not only be better protected against disturbing and deflecting influences, as hereinbefore named, and leakage, shaking, and destruction, or alteration in shape be guarded against, 8 5

but passage of wind and fire and entry of birds and Vermin will be more effectually avoided; also, the nails or fastenings used to secure the corrugated sheets to the corrugated battens will be less liable to rust, and '90 may be fewer in number, and better provision consequently be made for expansionand contraction of the sheets.

The corrugated battens may be made in any convenient or desired lengths and of any suitable size and shape, and be fixed to the purlins, framing, rails, studs, rafters, or boarding by nails or otherwise.

The attachment of the corrugated sheets to the corrugated battens may be by nails or too by any other means-such, for instance, as corrugated roofing has been heretofore secured by to different supports; but in myinvention the corrugationsin the sheets are arranged so that they will correspond with and nearly fit the corrugations of the battens, and thus cause the latter to give the necessary support at every fastening, and to receive the indents or burrs caused by punching the sheets, with holes adapted to receive the securing means, such as screws or nails, and which by my invention may be driven close home.

In practice I make the corrugations in the battens a little wider spaced than the corrugations in the sheets to allow for lateral stretching of the corrugated sheets in handling and fixing, thereby reducing trouble or labor in applying the sheets, and to a certain extent saving metal. Furthermore, by making the depressed portions of the battens a little deeper than the depressed portions of the sheets, as shown at c in the drawing, the sheets will rest only on the raised portions of the battens, and a space will be left between the depressed portions of the sheet and battens for the unobstructed passage of condensed moisture or sweat into the eavesspout of the building. Such construction also permits of ample ventilation beneath the corrugated sheets.

Numerous other advantages might be 30 .named for my invention; but it is unnecessary to do so here.

Having thus described my invention, whatI claim as new, and desire to secure by Letters Patent, is-

The hereinbefore-described improvement in corrugated structures, consisting of a series of purlins or supports, as C, corrugated battens, as B, supported thereon, having transverse coincident corrugations or depressions, 40 and corrugated sheets, as A, supported on said battens, the corrugations in said sheets being of a less depth than the corrugations in the battens, whereby an open space,as c, is formed at the base of the corrugations for the 5 p of condensed moisture or sweat and for ventilation, substantially as and for the purpose described.

' JOHN MITCHELL. Witnesses:

lnrrmm CORNELL, Justice of the Peace, Auckland.

ARTHUR M. Ems, Clerk, Auckland. 

